There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

I have Rs.50 and I spend it in the way as below.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

2, 3, 5, 9, 17, _ What is the next number in the sequence?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?